What's beneath this cube?

On International Museum Day, we're looking at the Centre Pompidou Málaga in Spain, an offshoot of the modern art museum in Paris. The piece we see here, El Cubo, created by French artist Daniel Buren, is the only part of the museum that's visible above ground. The glass cube functions as a multicoloured skylight, its panels projecting tinted light into the subterranean museum's courtyard below. This location was introduced in 2015 as a pop-up branch - a temporary, underground space for exhibitions and workshops dedicated to younger audiences. Originally scheduled for a five-year run, it was extended until 2025.
© Wim Wiskerke/Alamy